Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (7): 2162-2171.doi: 10.13229/j.cnki.jdxbgxb.20231121

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Numerical simulation of effect of valve timing on performance of in-cylinder direct-injection hydrogen internal combustion engine

Zhong-shu WANG1(),Di-ya A1,Yao-dong DU1(),Qian LI2,3,Xue-lin TANG2,Wei DENG2,Fang-xi XIE1   

  1. 1.College of Automotive Engineering，Jilin University，Changchun 130022，China
    2.Powertrain R&D Institute，Chongqing Changan Automobile Co. ，Ltd. ，Chongqing 401133，China
    3.College of Mechanical and Vehicle Engineering，Chonqqing University，Chongqing 400030，China
  • Received:2023-10-18 Online:2025-07-01 Published:2025-09-12
  • Contact: Yao-dong DU E-mail:wangzhongshu@jlu.edu.cn;duyd2021@jlu.edu.cn

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Abstract:

A one-dimensional GT-POWER model was built with a 1.5 T VVT in-cylinder direct-injection hydrogen internal combustion engine， and the effects of inlet and exhaust valve timing changes on the engine's air exchange process， power performance and economy were studied. When the engine speed is 2 700 r/min， the lean combustion strategy is adopted to keep the pulse width of hydrogen injection consistent under the full-load condition， and the inlet valve timing is advanced and the exhaust valve timing is delayed， the intake mass flow rate is increased， the effective thermal efficiency is increased from 40.8% to 41.07%， and the effective gas consumption is decreased. The engine speed is 5 500 r/min， the excess air coefficient is the same under the full-load condition， the inlet and exhaust valve delay strategy can increase the gas mass in the cylinder， reduce the pump gas loss， increase the power by 12.7% and slightly reduce the break specific gas consumption. The influence of exhaust valve timing on the power performance and economy of in-cylinder direct-injection hydrogen combustion engine is more significant than that of intake valve.

Key words: power engineering and engineering thermophysics, hydrogen internal combustion engine, in-cylinder direct injection, valve timing

CLC Number: 

  • TK431

Table 1

Engine specifications"

发动机参数数值
排量/L1.494
缸径×行程/（mm×mm）73.5×88
型式直列4缸4冲程4气门 水冷
压缩比13∶1
进气型式涡轮增压
最大净功率/kW105
最大净扭矩/（N·m）230

Fig.1

Simulation platform construction"

Fig.2

Model validation"

Fig.3

Valve-lift curve"

Table 2

Modeling scheme"

转速/（r·min-1）喷氢脉宽/ms过量空气系数进气门正时/°CA排气门正时/°CA
2 7001.791.72~1.9215，220，225，230，235，240，245118
2 7001.791.48~1.98230103，108，113，118，123，128，133
5 5002.12~2.721.55215，220，225，230，235，240，245118
55 001.88~2.881.55230103，108，113，118，123，128，133

Fig.4

Effect of valve timing on inlet mass flow"

Fig.5

Effect of valve timing on gas quality in cylinder"

Fig.6

Effect of valve overlap angle on coefficient of residual exhaust gas in cylinder"

Fig.7

Effect of valve timing on maximum pressure andmaximum combustion temperature in cylinder"

Fig.8

Effect of valve timing on effective thermalefficiency and BSFC"

Fig.9

Effect of valve timing on excess air coefficient and torque"

Fig.10

Effect of valve timing on inlet mass flow"

Fig.11

Effect of valve timing on gas quality in cylinder"

Fig.12

Effect of valve timing on maximum pressure andmaximum combustion temperature in cylinder"

Fig.13

Effect of valve timing on power performanceand economy"

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